CG test written and passes i.e. converges with small true residual

in RedBlack MpcDagMpc, Unprec MdagM and Schur red black solver for
each of.

DomainWallFermion
MobiusFermion
MobiusZolotarevFermion
ScaledShamirFermion
ScaledShamirZolotarevFermion

benchmarks/Benchmark_wilson.cc

@@ -0,0 +1,143 @@
+#include <Grid.h>
+
+using namespace std;
+using namespace Grid;
+using namespace Grid::QCD;
+
+template<class d>
+struct scal {
+  d internal;
+};
+
+  Gamma::GammaMatrix Gmu [] = {
+    Gamma::GammaX,
+    Gamma::GammaY,
+    Gamma::GammaZ,
+    Gamma::GammaT
+  };
+
+int main (int argc, char ** argv)
+{
+  Grid_init(&argc,&argv);
+
+
+  std::vector<int> latt_size   = GridDefaultLatt();
+  std::vector<int> simd_layout = GridDefaultSimd(Nd,vComplexF::Nsimd());
+  std::vector<int> mpi_layout  = GridDefaultMpi();
+  GridCartesian               Grid(latt_size,simd_layout,mpi_layout);
+  GridRedBlackCartesian     RBGrid(latt_size,simd_layout,mpi_layout);
+
+  int threads = GridThread::GetThreads();
+  std::cout << "Grid is setup to use "<<threads<<" threads"<<std::endl;
+
+  std::vector<int> seeds({1,2,3,4});
+  GridParallelRNG          pRNG(&Grid);
+  pRNG.SeedFixedIntegers(seeds);
+  //  pRNG.SeedRandomDevice();
+
+  LatticeFermion src   (&Grid); random(pRNG,src);
+  LatticeFermion result(&Grid); result=zero;
+  LatticeFermion    ref(&Grid);    ref=zero;
+  LatticeFermion    tmp(&Grid);    tmp=zero;
+  LatticeFermion    err(&Grid);    tmp=zero;
+  LatticeGaugeField Umu(&Grid); random(pRNG,Umu);
+  std::vector<LatticeColourMatrix> U(4,&Grid);
+
+  double volume=1;
+  for(int mu=0;mu<Nd;mu++){
+    volume=volume*latt_size[mu];
+  }  
+
+  // Only one non-zero (y)
+#if 0
+  Umu=zero;
+  Complex cone(1.0,0.0);
+  for(int nn=0;nn<Nd;nn++){
+    random(pRNG,U[nn]);
+    if(0) {
+      if (nn==-1) { U[nn]=zero; std::cout << "zeroing gauge field in dir "<<nn<<std::endl; }
+      else       { U[nn] = cone;std::cout << "unit gauge field in dir "<<nn<<std::endl; }
+    }
+    pokeIndex<LorentzIndex>(Umu,U[nn],nn);
+  }
+#endif
+
+  for(int mu=0;mu<Nd;mu++){
+    U[mu] = peekIndex<LorentzIndex>(Umu,mu);
+  }
+  
+  { // Naive wilson implementation
+    ref = zero;
+    for(int mu=0;mu<Nd;mu++){
+      //    ref =  src + Gamma(Gamma::GammaX)* src ; // 1-gamma_x
+      tmp = U[mu]*Cshift(src,mu,1);
+      for(int i=0;i<ref._odata.size();i++){
+	ref._odata[i]+= tmp._odata[i] + Gamma(Gmu[mu])*tmp._odata[i]; ;
+      }
+
+      tmp =adj(U[mu])*src;
+      tmp =Cshift(tmp,mu,-1);
+      for(int i=0;i<ref._odata.size();i++){
+	ref._odata[i]+= tmp._odata[i] - Gamma(Gmu[mu])*tmp._odata[i]; ;
+      }
+    }
+  }
+  ref = -0.5*ref;
+  RealD mass=0.1;
+  WilsonFermion Dw(Umu,Grid,RBGrid,mass);
+  
+  std::cout << "Calling Dw"<<std::endl;
+  int ncall=10000;
+  double t0=usecond();
+  for(int i=0;i<ncall;i++){
+    Dw.Dhop(src,result,0);
+  }
+  double t1=usecond();
+  double flops=1344*volume*ncall;
+  
+  std::cout << "Called Dw"<<std::endl;
+  std::cout << "norm result "<< norm2(result)<<std::endl;
+  std::cout << "norm ref    "<< norm2(ref)<<std::endl;
+  std::cout << "mflop/s =   "<< flops/(t1-t0)<<std::endl;
+  err = ref-result; 
+  std::cout << "norm diff   "<< norm2(err)<<std::endl;
+
+
+  //  for(int ss=0;ss<10;ss++ ){
+  for(int ss=0;ss<0;ss++ ){
+    for(int i=0;i<Ns;i++){
+      for(int j=0;j<Nc;j++){
+	ComplexF * ref_p = (ComplexF *)&ref._odata[ss]()(i)(j);
+	ComplexF * res_p = (ComplexF *)&result._odata[ss]()(i)(j);
+	std::cout << ss<< " "<<i<<" "<<j<<" "<< (*ref_p)<<" " <<(*res_p)<<std::endl;
+      }
+    }
+  }
+
+  { // Naive wilson dag implementation
+    ref = zero;
+    for(int mu=0;mu<Nd;mu++){
+
+      //    ref =  src - Gamma(Gamma::GammaX)* src ; // 1+gamma_x
+      tmp = U[mu]*Cshift(src,mu,1);
+      for(int i=0;i<ref._odata.size();i++){
+	ref._odata[i]+= tmp._odata[i] - Gamma(Gmu[mu])*tmp._odata[i]; ;
+      }
+
+      tmp =adj(U[mu])*src;
+      tmp =Cshift(tmp,mu,-1);
+      for(int i=0;i<ref._odata.size();i++){
+	ref._odata[i]+= tmp._odata[i] + Gamma(Gmu[mu])*tmp._odata[i]; ;
+      }
+    }
+  }
+  ref = -0.5*ref;
+  Dw.Dhop(src,result,1);
+  std::cout << "Called DwDag"<<std::endl;
+  std::cout << "norm result "<< norm2(result)<<std::endl;
+  std::cout << "norm ref    "<< norm2(ref)<<std::endl;
+  err = ref-result; 
+  std::cout << "norm diff   "<< norm2(err)<<std::endl;
+
+  Grid_finalize();
+}